Roller board



FIG. 1 is a perspective view of a right roller board showing my newdesign, the left being a mirror image thereof;

FIG. 2 is a left side view thereof, the right side view being a mirrorimage;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The portions of the article shown in broken lines form no part of theclaimed design.

The ornamental design for a roller board, as shown and described.